Cap or socket for incandescent electric lamps and the like



- 1630126 May 24,1927. A B. MARSAT car on socxsw FOR INCANDESCENT ELECTRIC LAMPS AND was LIKE Filed Jan- 26, 1925 I 4&

Patented May 24, 192 7.-

UNITED STATES- PATENT OFFICE.

ANTOINE JEAN BAPTISTE-MARSAT, F VERRIERES-LE-BUISSGN, FRANCE.

CAP 03 SOCKET FOR INCANDESCENT ELECTRIC LAMPS AND THE LIKE.

Application filed January 26, 1925, Serial No. 4,849, and in France February 6, 1824.

The present invention relates to incandescent electric lamps andthe like, and has for its-object to enable a well-defined position to be given to the filament with respect to the fixing parts of the cap or socket, the

ID ing latter being made in two parts, the one interior, which is fixed with respect to the bulb and has a spherical part the other exterior and cylindrical which carries the fixparts and the two parts of .the socket bemg soldered together in order to fix them with respect to each other in a definite manner, when the adjustment has been efiected. In practice the operation of soldering the two parts presents somewhat great difficulties. It is necessary, in order that the solder may take well, that the two parts he brought to a sufliciently high temperature and, as far as possible, to the same temperature. Now in the case under consideration, it is not easy to heat the interior part. Further, it is necessary that the solder covers those places where the two parts of the socket only leave a very small space between them; this space is at a certain distance from the edge of the exterior part and not readily accessible Finally, the blow-pipe or soldering iron must not be caused to approach too near to the bulb, which might cause this latter to I be fractured.

' With a 'view to remedying these inconveniences, the first method which would occur to a practical man would consist in first, 'tinning the two parts which require to be connected together, then placing them one in the other and causin the fusion of the tin by a plying the sol ering iron or blowpipe, ju ging the spot where it is presumed the two parts are in contact. This rocess would have many inconveniences; it 1sv difiicult to give to the layer of tin a very regular thickness which is necessary in order that the two arts may articulate one with respect to-t e other without play; if this tin- 'mn is carried into effect before placing in osltion the vitreous block, which forms the I ottom of the outer socket, at the moment when this vitreous block is placed in position, the tin will melt, will flow and will only have an irregular thickness and will collect where it is useless, leaving bare the higherpart where it would be necessary; if an attempt is made to tin the sockets provided with their vitreous blocks, it will frequently happen that this block will crack and become unfit for use. In this method the workman will not be able to see the moment at which the tin melts and he will be obliged to stop the heating quite by chance; he cannot be sure that the solder has properly connected. the two parts. Finally, when introducing the interior part into the exterior part it would be possible to enlarge this latter without being aware of it. I

The present invention enables one to avoid all these inconveniences. It consists in roviding theexterior part with little openings placed preferably in front of the most projecting portion of the interior part which enables one to act directly upon the interior part and thus to reduce the diiference of temperature between it and the exterior part, and further, to efiect the soldering in the immediate neighbourhood of the line of contact between the interior part and the exterior part; that is to say, at the point where it has the greatestchance of holding well without causing the soldering iron or the blow-pipe employed for this soldering operation to approach too near to the bulb.

In order that the invention may bebetter understood, there has been represented in the accompanying drawing given by way of example only, a method of carrying the invention into efiect. I

' Fig. 1 is a view in elevation of the interior part of the socket.

. Fig. 2 is a vertical section of the same.

Fig. 3 is a view in elevation of the exterior part of the socket.

Fig. 4; is a vertical section. F Fig. 5 is a plan view corresponding to lg. a

Fi 6 shows in section the two parts assemb ed.

As shown in the drawing, the interior part of the socket is formed of a metal part 1 a Fi 1 and 2 having the form of a cone terminated by a rounded part. It may also be in the form of a toric ring, a spherical zone, etc.

The exterior part b is c lindrical in Figs. 3 to 5. It results that if t e'two parts a' and b are engaged one in the other their respective positions may be modified as desired. For exam 1e, if the part a isfixed with respect to e bulb and the filament and the part b is placed in an adjusted apparatus, it is possibleto determine the exact positlon of the two parts a and b with respect to each other, so that the filament occu ies the desired position so that when the amp is in operation the filament is exactly in the focus of the projection apparatus.

The part b is provided with openings 0, the number, the form and the size of which may be varied according to circumstances.

The two parts a and 6 being placed as desired, as just above explained, they are fixed in this position by soldering them at the position of the openings 0; Fig. 6 shows a spot of solder placed at d connecting the two parts a and b.

It is evident that the soldering is easily carried into effect in the position of the said openings. It is possible to heat the interior part through these latter and the solder placed between these two heated parts slightly separated acts surely and connects them solidly.

Instead of soldering, the two parts may be brazed. Inthis case the openings 0 permit the heating of the part a by means of the flame of the blow-pipe employed for brazing, as they permit the heating with the soldering iron. The advantages of the new construction are the same as those obtained inthe case of soldering.

Instead of openings arranged in certain places, a large number of openings may be arranged regularly over the whole surface, so that the whole of the wall of the part b is perforated, which would still further facihtate the heating of the interior part.

The invention is not only applicable to electric lamps, but also to certain scientific apparatus, such as thermostats, thermo-elec-.

tric batteries, photo-electric batteries, etc., which are placed in bulbs similar incandescent electric lamp bulbs, and which also,

\in order to give a good effect, should occupy a very definite position.

The above arrangements are only given by v other, the exterior one being cylindrical and carryin means by which it may be secured in position, the exterior part having openings adapted toreceive the solder or brazing mixture for connecting the exterior part with the interior part.

'2. In electric incandescent lamps and the like a plug ,in two parts, the interior one being fixed with respect to the bulb and having a spherical part,'the exterior one being cylindrical and carrying means by which it may be secured in position, the exterior part having openings adapted to receive the solder or brazing mixture for connecting the exterior pgrt with the interior part, the openings that the tangency line ofthe spherical part and of the cylindrical part isbefore these openings, when the adjustment has been effected.

The foregoing specification of my improvement in caps or sockets for incandescent electric lamps and the like signed by me this 16th day of January, 1925.

ANTOINE JEAN BAPTISTE MARSAT.

ing arranged in such a position 

